﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Reflection;
using System.Data;

/*  Dotcat DataWrangler  By K.A Lindström (c) 2010 Licensed under LGPL 
 * My brain farts i wanna get out for code review (all sciense like) like my active record implementation
  
  Its writen in C# and only supports Mysql at this point in time...
  Its a generic based active record implementatrion... highly experimental...
 * Apended...
 * This version is specialy tailored for SQL lite thus the name LiteWrangler
 * Enjoy :3
 
 I'm publishing it just to get the idea out there.. i havent seen any generics based active record so i wanna se what people thing...
 
 Lunacy or genious all sciense requires peer review after all :3 
 
 One of the important design considerations if making this is one simple moto....
 Simplicity or FUCK OFF!  (i mean frameworks like this are supposed to speed 
 development and free you up to do better design and be more creative...
  
 Not bog you down in messy code...
           
 
  this is not and does not aim to be any kind of enterprice framwork... 
  its just for simple fun coding at this point in time...
  basicaly just a mad idea i had i wanna get out there to see what people think...
  I just havent seen anyone implement active record with generics... (i havent tried Scala yet though... there generics crazy =^_^=)
 
           
  Currently i am using this in a codeigniter like fashion following a model view controler format...
  
  (down bellow is the LGPL licens if you havent read if allready... share and enjoy!)              
 
 
 
  
 
                   GNU LESSER GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.


  This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.

  0. Additional Definitions.

  As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.

  "The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.

  An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.

  A "Combined Work" is a work produced by combining or linking an
Application with the Library.  The particular version of the Library
with which the Combined Work was made is also called the "Linked
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  The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
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  The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.

  1. Exception to Section 3 of the GNU GPL.

  You may convey a covered work under sections 3 and 4 of this License
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  2. Conveying Modified Versions.

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 */

namespace OmniCatz
{
    /// <summary>
    /// per default a string is represented by VARCHAR(255)
    /// when this attribute is added it is instead stored as TEXT in the database
    /// </summary>
    [AttributeUsage(AttributeTargets.All)]
    public class Text : System.Attribute
    { }

    /// <summary>
    /// Ignores this element when saving or creating a table.... ideal for if you want to put adding lists to fill with related classes
    /// </summary>
    [AttributeUsage(AttributeTargets.All)]
    public class Ignore : System.Attribute

    { }
    /// <summary>
    /// Sets which value to use as primary key.... DONT SET THIS FOR MORE THEN ONE ELEMENT!!! this does not support composit keys at this moment...
    /// </summary>
    [AttributeUsage(AttributeTargets.All)]
    public class PrimaryKey : System.Attribute
    { }


    [AttributeUsage(AttributeTargets.All)]
    public class DatabaseName : System.Attribute
    {
        private string name;
        public string Name
        {
            get { return name; }
        }
        public DatabaseName(string name)
        {
            this.name = name;
        }

    }


    public class DataWrangler<T>
    {


        /// <summary>
        /// This can probably be dont a hell of a lot better... and this is probaly one of the main snags in making this work with other databases...
        /// </summary>
        /// <param name="t">Type of the property to be saved to to be saved to the database</param>
        /// <returns>Equivilant Mysql type</returns>
        private static string sqlType(Type t)
        {
            string result = "";




            if (t == typeof(int))
            {
                result = "INTEGER";
            }
            else
                if (t == typeof(decimal))
                {
                    result = "DOUBLE";
                }
                else
                    if (t == typeof(string))
                    {


                        if (t.Attributes.GetType() == typeof(Text))
                            result = "TEXT";
                        else
                            result = "VARCHAR(255)";
                    }
                    else
                        if (t == typeof(DateTime))
                        {
                            result = "DATETIME";
                        }
                        else
                            if (t == typeof(bool))
                            {
                                result = "BOOLEAN";
                            }

            return result;

        }

        /// <summary>
        /// Looks for the DotCat.PrimaryKey attrubute
        /// </summary>
        /// <returns>string property name of the correct value</returns>
        private static string getPrimaryKey()
        {
            string result = "";
            PropertyInfo[] info = typeof(T).GetProperties();
            foreach (PropertyInfo prop in info)
            {
                object[] attrib = prop.GetCustomAttributes(true);

                if (attrib.OfType<PrimaryKey>().Count() > 0)
                {
                    result = prop.Name;
                    break;
                }

            }
            return result;
        }

        /// <summary>
        /// Just gets all of rows in the table related to this class
        /// </summary>
        /// <param name="connection"></param>
        /// <returns></returns>
        public static List<T> GetAll(IDbConnection connection)
        {
            string IDName = getPrimaryKey();

            List<T> result = new List<T>();




            IDbCommand commmand = connection.CreateCommand();

            string sql = string.Format("select * from {0}", typeof(T).Name);
            commmand.CommandText = sql;
            using (IDataReader reader = commmand.ExecuteReader())
            {


                while (reader.Read())
                {
                    T item = (T)typeof(T).GetConstructor(new Type[0]).Invoke(new object[0]);



                    foreach (PropertyInfo prop in typeof(T).GetProperties())
                    {
                  

                            if (prop.GetCustomAttributes(true).OfType<Ignore>().Count() != 0)
                            {
                                //Ignore
                            }
                            else
                            {
                                object value = reader[prop.Name];

                                if (reader[prop.Name] == DBNull.Value)
                                    value = null;

                                if (prop.PropertyType == typeof(int))
                                {
                                
                                    prop.SetValue(item, Convert.ToInt32(value.ToString()), null);
                        
                                }
                                else
                                    if (prop.PropertyType == typeof(string))
                                    {
                                        if (value == null)
                                            value = "";
                                        prop.SetValue(item, value.ToString(), null);
                                
                                    }
                                    else
                                        if (prop.PropertyType == typeof(decimal))
                                        {
                          
                                            prop.SetValue(item, Convert.ToDecimal(value), null);
                             
                                        }
                                        else
                                            if (prop.PropertyType == typeof(bool))
                                            {
                                    
                                                prop.SetValue(item, Convert.ToBoolean(value), null);
                                        
                                            }
                                            else
                                                if (prop.PropertyType == typeof(DateTime))
                                                {
                                       
                                                    prop.SetValue(item, Convert.ToDateTime(value), null);
                                             
                                                }
                                                else
                                                {
                                                    prop.SetValue(item, value, null);
                                                }

                            }
            


                    }



                    result.Add(item);

                }
            }






            return result;
        }

        public static List<T> GetAllByValue(IDbConnection connection,string key, object value_)
        {
            string IDName = getPrimaryKey();

            List<T> result = new List<T>();



            if (typeof(T).GetProperties().ToList().Exists(n => n.Name == key))
            {
                IDbCommand commmand = connection.CreateCommand();

                string sql = string.Format("select * from {0} where {1} = @value", typeof(T).Name,key);
                commmand.CommandText = sql;



                IDataParameter parameter = commmand.CreateParameter();
                parameter.ParameterName = "@value";
                parameter.Value = value_;
                commmand.Parameters.Add(parameter);

                using (IDataReader reader = commmand.ExecuteReader())
                {


                    while (reader.Read())
                    {
                        T item = (T)typeof(T).GetConstructor(new Type[0]).Invoke(new object[0]);



                        foreach (PropertyInfo prop in typeof(T).GetProperties())
                        {


                            if (prop.GetCustomAttributes(true).OfType<Ignore>().Count() != 0)
                            {
                                //Ignore
                            }
                            else
                            {
                                object value = reader[prop.Name];

                                if (reader[prop.Name] == DBNull.Value)
                                    value = null;

                                if (prop.PropertyType == typeof(int))
                                {

                                    prop.SetValue(item, Convert.ToInt32(value.ToString()), null);

                                }
                                else
                                    if (prop.PropertyType == typeof(string))
                                    {
                                        if (value == null)
                                            value = "";
                                        prop.SetValue(item, value.ToString(), null);

                                    }
                                    else
                                        if (prop.PropertyType == typeof(decimal))
                                        {

                                            prop.SetValue(item, Convert.ToDecimal(value), null);

                                        }
                                        else
                                            if (prop.PropertyType == typeof(bool))
                                            {

                                                prop.SetValue(item, Convert.ToBoolean(value), null);

                                            }
                                            else
                                                if (prop.PropertyType == typeof(DateTime))
                                                {

                                                    prop.SetValue(item, Convert.ToDateTime(value), null);

                                                }
                                                else
                                                {
                                                    prop.SetValue(item, value, null);
                                                }

                            }



                        }



                        result.Add(item);

                    }
                }




            }

            return result;
        }

        public static List<T> GetAllByValue(IDbConnection connection, System.Collections.Generic.Dictionary<string, string> WhereParams)
        {
            string IDName = getPrimaryKey();

            List<T> result = new List<T>();

            bool flag = true;
            IDbCommand commmand = connection.CreateCommand();

             List<PropertyInfo> properties = typeof(T).GetProperties().ToList();
             System.Text.StringBuilder builder = new System.Text.StringBuilder();

             builder.Append("select * from ");
            foreach (KeyValuePair<string, string> parameters in WhereParams)
            {
                if (!properties.Exists(n => n.Name == parameters.Key))
                {
                    flag = false;
                    IDataParameter parameter = commmand.CreateParameter();
                    parameter.ParameterName = "@value";
                    parameter.Value = parameters.Value;
                    commmand.Parameters.Add(parameter);
                    builder.Append(parameters.Key);
                    builder.Append("=");
                    builder.Append(parameters.Value);
                    builder.Append(",");
                }
            }

            if (builder.ToString().EndsWith(","))
            {
                builder.Remove(builder.Length, 1);
            }
            if (flag)
            {



                commmand.CommandText = builder.ToString();



           

                using (IDataReader reader = commmand.ExecuteReader())
                {


                    while (reader.Read())
                    {
                        T item = (T)typeof(T).GetConstructor(new Type[0]).Invoke(new object[0]);



                        foreach (PropertyInfo prop in typeof(T).GetProperties())
                        {


                            if (prop.GetCustomAttributes(true).OfType<Ignore>().Count() != 0)
                            {
                                //Ignore
                            }
                            else
                            {
                                object value = reader[prop.Name];

                                if (reader[prop.Name] == DBNull.Value)
                                    value = null;

                                if (prop.PropertyType == typeof(int))
                                {

                                    prop.SetValue(item, Convert.ToInt32(value.ToString()), null);

                                }
                                else
                                    if (prop.PropertyType == typeof(string))
                                    {
                                        if (value == null)
                                            value = "";
                                        prop.SetValue(item, value.ToString(), null);

                                    }
                                    else
                                        if (prop.PropertyType == typeof(decimal))
                                        {

                                            prop.SetValue(item, Convert.ToDecimal(value), null);

                                        }
                                        else
                                            if (prop.PropertyType == typeof(bool))
                                            {

                                                prop.SetValue(item, Convert.ToBoolean(value), null);

                                            }
                                            else
                                                if (prop.PropertyType == typeof(DateTime))
                                                {

                                                    prop.SetValue(item, Convert.ToDateTime(value), null);

                                                }
                                                else
                                                {
                                                    prop.SetValue(item, value, null);
                                                }

                            }



                        }



                        result.Add(item);

                    }
                }




            }

            return result;
        }

     


        /// <summary>
        /// used to set orde of result
        /// </summary>
        public enum OrderType { ASC, DESC }


        /// <summary>
        /// Ordered version of GetAll where the ordering is dont in the database... this could be dont in linq too... not sure which is faster.
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="orderby"></param>
        /// <param name="type"></param>
        /// <returns></returns>
        public static List<T> GetAllOrderBy(IDbConnection connection, string orderby, OrderType type)
        {
            string IDName = getPrimaryKey();

            List<T> result = new List<T>();

            IDbCommand commmand = connection.CreateCommand();

            string sql = string.Format("SELECT * FROM {0} ORDER BY {1} {2}", typeof(T).Name, orderby, type);
            commmand.CommandText = sql;
            using (IDataReader reader = commmand.ExecuteReader())
            {
                while (reader.Read())
                {
                    T item = (T)typeof(T).GetConstructor(new Type[0]).Invoke(new object[0]);


                    foreach (PropertyInfo prop in typeof(T).GetProperties())
                    {

                        if (prop.GetCustomAttributes(true).OfType<Ignore>().Count() != 0)
                        {
                            //Ignore
                        }
                        else
                        {
                            object value = reader[prop.Name];

                            if (prop.PropertyType == typeof(int))
                            {
                                prop.SetValue(item, Convert.ToInt32(value.ToString()), null);
                            }
                            else
                                if (prop.PropertyType == typeof(string))
                                {
                                    prop.SetValue(item, value.ToString(), null);
                                }
                                else
                                    if (prop.PropertyType == typeof(decimal))
                                    {
                                        prop.SetValue(item, Convert.ToDecimal(value), null);
                                    }
                                    else
                                        if (prop.PropertyType == typeof(bool))
                                        {
                                            prop.SetValue(item, Convert.ToBoolean(value), null);
                                        }
                                        else
                                            if (prop.PropertyType == typeof(DateTime))
                                            {
                                                prop.SetValue(item, Convert.ToDateTime(value), null);
                                            }
                                            else
                                            {
                                                prop.SetValue(item, value, null);
                                            }
                        }
                    }

                    result.Add(item);

                }
            }






            return result;
        }



        /// <summary>
        /// Get by Primarykey Id
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="id"></param>
        /// <returns></returns>
        public static T Get(IDbConnection connection, int id)
        {
            string IDName = getPrimaryKey();
            T item = (T)typeof(T).GetConstructor(new Type[0]).Invoke(new object[0]);

            IDbCommand commmand = connection.CreateCommand();

            string sql = string.Format("select * from {0} where {2}={1}", typeof(T).Name, id, IDName);
            commmand.CommandText = sql;
            using (IDataReader reader = commmand.ExecuteReader())
            {
                while (reader.Read())
                {

                    foreach (PropertyInfo prop in typeof(T).GetProperties())
                    {

                        int temp = prop.GetCustomAttributes(true).OfType<OmniCatz.Ignore>().Count();
                        if (temp == 0)
                        {
                            object value = reader[prop.Name];

                            if (prop.PropertyType == typeof(int))
                            {
                                prop.SetValue(item, Convert.ToInt32(value.ToString()), null);
                            }
                            else
                                if (prop.PropertyType == typeof(string))
                                {
                                    prop.SetValue(item, value.ToString(), null);
                                }
                                else
                                    if (prop.PropertyType == typeof(decimal))
                                    {
                                        prop.SetValue(item, Convert.ToDecimal(value), null);
                                    }
                                    else
                                        if (prop.PropertyType == typeof(bool))
                                        {
                                            prop.SetValue(item, Convert.ToBoolean(value), null);
                                        }
                                        else
                                            if (prop.PropertyType == typeof(DateTime))
                                            {
                                                prop.SetValue(item, Convert.ToDateTime(value), null);
                                            }
                                            else
                                            {
                                                prop.SetValue(item, value, null);
                                            }
                        }

                    }

                }
            }






            return item;
        }

        /// <summary>
        /// Experimental where condition adding.. not sure i like this... it seams to prone to SQL injections... basicaly it is a SQL injection... need to find something better...
        /// consider this fuction very very depricated...
        /// I should probably just remove it but blah!
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="whereStatement"></param>
        /// <returns></returns>
        public static List<T> GetAll(IDbConnection connection, string whereStatement)
        {
            string IDName = getPrimaryKey();

            List<T> result = new List<T>();

            IDbCommand commmand = connection.CreateCommand();

            string sql = string.Format("select * from {0} where {1}", typeof(T).Name, whereStatement);
            commmand.CommandText = sql;
            using (IDataReader reader = commmand.ExecuteReader())
            {
                while (reader.Read())
                {
                    T item = (T)typeof(T).GetConstructor(new Type[0]).Invoke(new object[0]);


                    foreach (PropertyInfo prop in typeof(T).GetProperties())
                    {


                        if (prop.GetCustomAttributes(true).OfType<Ignore>().Count() != 0)
                        {
                            //Ignore
                        }
                        else
                        {
                            object value = reader[prop.Name];

                            if (prop.PropertyType == typeof(int))
                            {
                                prop.SetValue(item, Convert.ToInt32(value.ToString()), null);
                            }
                            else
                                if (prop.PropertyType == typeof(string))
                                {
                                    prop.SetValue(item, value.ToString(), null);
                                }
                                else
                                    if (prop.PropertyType == typeof(decimal))
                                    {
                                        prop.SetValue(item, Convert.ToDecimal(value), null);
                                    }
                                    else
                                        if (prop.PropertyType == typeof(bool))
                                        {
                                            prop.SetValue(item, Convert.ToBoolean(value), null);
                                        }
                                        else
                                            if (prop.PropertyType == typeof(DateTime))
                                            {
                                                prop.SetValue(item, Convert.ToDateTime(value), null);
                                            }
                                            else
                                            {
                                                prop.SetValue(item, value, null);
                                            }
                        }
                    }

                    result.Add(item);

                }
            }






            return result;
        }






        /// <summary>
        /// Save the obj object
        /// </summary>
        /// <param name="connection">Mysql connection</param>
        /// <param name="obj">Object to be saved</param>
        /// <param name="id">this id should be set to -1 if your adding a new row.. or the currend id if your updating</param>
        public static void Save(IDbConnection connection, T obj, int id)
        {
            string IDName = getPrimaryKey();

            IDbCommand commmand = connection.CreateCommand();


            commmand.CommandText = string.Format("select count(*) from {0} where {1}={0}", typeof(T).Name, IDName);


            string Insert = string.Format("Insert into {0}", typeof(T).Name);
            string Update = string.Format("Update {0} set ", typeof(T).Name);
            string Insert2 = "(";
            string Insert3 = "(";

            bool flag = false;

            foreach (PropertyInfo prop in typeof(T).GetProperties())
            {

                if (prop.GetCustomAttributes(true).OfType<Ignore>().Count() == 0)
                {
                    if (prop.Name.ToLower() != IDName.ToLower())
                    {
                        if (flag)
                        {
                            Update += ", ";
                            Insert2 += ", ";
                            Insert3 += ", ";

                        }
                        else
                        {
                            flag = true;
                        }

                        Update += string.Format("{0}=?{0}", prop.Name);
                        Insert2 += string.Format("{0}", prop.Name);
                        Insert3 += string.Format("@{0}", prop.Name);
                    }
                    IDataParameter parameter = commmand.CreateParameter();
                    parameter.ParameterName = "@" + prop.Name;
                    parameter.Value = prop.GetValue(obj, null);
                    commmand.Parameters.Add(parameter);
                }


            }
            Insert += Insert2 + ") values " + Insert3 + ");";

            commmand.CommandText = string.Format("select count(*) from {0} where {1}={2}", typeof(T).Name, IDName, id);

            object y = commmand.ExecuteScalar();
            int x = int.Parse(y.ToString());
            if (x == 0)
            {
                commmand.CommandText = Insert;
                commmand.ExecuteNonQuery();
            }
            else
            {
                commmand.CommandText = string.Format("{0} Where {1}=@{1}", Update, IDName);
                commmand.ExecuteNonQuery();
            }
        }
      
        /// <summary>
        /// I call this delete function murder because you might want ot consider flaging something as removed rather then just deleting it...
        /// so this is just a helpfull reminder to be thaugtfull about that...
        /// </summary>
        /// <param name="connection"></param>
        /// <param name="id"></param>
        public static void Murder(IDbConnection connection, int id)
        {
            string IDName = getPrimaryKey();
            IDbCommand command = connection.CreateCommand();
            command.CommandText = string.Format(@"DELETE FROM {0}
WHERE {2}={1}", typeof(T).Name, id, IDName);



            command.ExecuteNonQuery();
        }

        /// <summary>
        /// If your do lazy make your own tables :3
        /// this fucntion does it for you though some tweeking might be advicable... (like setting varchar lengths
        /// </summary>
        /// <param name="connection"></param>
        public static void Create(IDbConnection connection)
        {
            string IDName = getPrimaryKey();
            string SQL = string.Format(
    @"Create table {0}(
Id INTEGER PRIMARY KEY AUTOINCREMENT ", typeof(T).Name);

            foreach (PropertyInfo prop in typeof(T).GetProperties())
            {
                if (prop.GetCustomAttributes(true).OfType<OmniCatz.Ignore>().Count() == 0)
                    if (prop.Name != IDName)
                    {
                        SQL += string.Format(",{0} {1}", prop.Name, sqlType(prop.PropertyType));
                    }
            }
            SQL += ");";


            IDbCommand command = connection.CreateCommand();
            command.CommandText = SQL;
            command.ExecuteNonQuery();

        }
        public static void Drop(IDbConnection connection)
        {
            string IDName = getPrimaryKey();
            string SQL = string.Format(
            @"Drop table {0}", typeof(T).Name);


     
                IDbCommand command = connection.CreateCommand();
                command.CommandText = SQL;
                try
                {
                    command.ExecuteNonQuery();
                }
                catch (Exception ex)
                { 
                
                }

        }

        
        /// <summary>
        /// To be run after you inset something with a -1 Id so you can collect the new id
        /// </summary>
        /// <param name="connection"></param>
        /// <returns></returns>
        public static int LastInsertID(IDbConnection connection)
        {
            string SQL = "SELECT last_insert_rowid();";
            IDbCommand command = connection.CreateCommand();
            command.CommandText = SQL;

            return int.Parse(command.ExecuteScalar().ToString());

        }

    }
}